1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

DisplayPort MST Support Is In The Works For Linux

Hardware

Published on 02 April 2014 10:37 AM EDT
Written by Michael Larabel in Hardware
10 Comments

David Airlie has begun hacking on DisplayPort Multi-Stream Transport handling for the open-source DRM/KMS graphics drivers.

Multi-Stream Transport (MST) is what allows daisy-chaining multiple DisplayPort displays off a single DisplayPort connector. Multi-Stream Transport was added to the DisplayPort 1.2 specification and can be achieved not only by daisy-chaining but also using a MST hub for having up to three connectors off a single DisplayPort connector.

DisplayPort MST is common right now among some 4K DisplayPort monitors that are technically two panels exposed side-by-side. It was also discovered that among newer Lenovo ThinkPad docks they are using one DisplayPort connector and then from the dock exposing VGA, HDMI, DVI, and DisplayPort connections. This is what's led David Airlie at Red Hat to begun hacking on the MST handling for the DRM/KMS drivers.

Right now trying to use MST will just yield a single-stream and the same image being broadcast across all displays. So far David has brought up the first step of encoding the topolgy discovery message and receiving responses from the dock. However, there's much more work ahead. Besides the Lenovo dock, he will also be playing aorund with a DP MST hub for AMD and NVIDIA DRM graphics drivers with the ThinkPad T440s using Intel graphics. More details on this open-source DisplayPort MST work can be found via David's blog. The only downside to this work is that it's taking him away from Virgil3D development.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. Running Fedora 20 On Intel's Core i7 Haswell-E Platform
  2. A Tour Of The New Phoronix Office
  3. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  4. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
Latest Linux News
  1. Counter-Strike: Global Offensive Starts Rolling Out To Linux Users
  2. The Gestures Support Of GNOME 3.14
  3. Linux 3.17 Has Basic Support For The Xbox One Controller
  4. openSUSE 13.2 Beta Still Using Btrfs By Default, & KDE Plasma 5 For Testing
  5. GTK+ 3.14 Brings Much Better Wayland Support, Multi-Touch, New Theme
  6. DisplayPort Comes To USB's Type-C Connector
  7. NSS Updated On Ubuntu 12.04/14.04 To Allow Netflix Support
  8. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  9. X.Org Server 1.16.1 Released
  10. Mesa Gets Closer To Having OpenGL 4.0 Tessellation Support
Latest Forum Discussions
  1. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  2. Uselessd: A Stripped Down Version Of Systemd
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. State of Nouveau now and in the near future?
  5. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  6. NVIDIA GTX 770/780 -works ?
  7. New stress testing utility for GPU's
  8. How to get Catalyst 14.4 working on Ubuntu 14.04